US3942382A - Pressure transducer - Google Patents
Pressure transducer Download PDFInfo
- Publication number
- US3942382A US3942382A US05/515,682 US51568274A US3942382A US 3942382 A US3942382 A US 3942382A US 51568274 A US51568274 A US 51568274A US 3942382 A US3942382 A US 3942382A
- Authority
- US
- United States
- Prior art keywords
- liquid
- pressure transducer
- measuring cell
- pressure
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0091—Transmitting or indicating the displacement of liquid mediums by electrical, electromechanical, magnetic or electromagnetic means
- G01L9/0092—Transmitting or indicating the displacement of liquid mediums by electrical, electromechanical, magnetic or electromagnetic means using variations in ohmic resistance
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/025—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning with temperature compensating means
Definitions
- the present invention relates to a pressure transducer and, more particularly, a pressure transducer for medical and physiological pressure measurements.
- the pressure transducer includes a measuring cell which is partly filled with a liquid and with the remainder being filled with a gas; a conduit filled with the liquid extending from the measuring cell, and which is open at an end thereof remote from the measuring cell; and means in the pressure transducer for generating an electrical value which corresponds to the particular gas volume.
- the pressure transducer is constituted of two concentrically positioned plastic material catheters 1 and 2, intermediate which there are located two platinum wires 3.
- the thinner or inner catheter 2 has one end surface thereof forming the boundary of a cylindrical chamber 4, the latter of which comprises the actual measuring cell.
- a capillary tube 5 is sealingly connected with the catheter 2 so as to connect the inner space of the hollow catheter 2 with the inner space of the chamber 4, and extends into this chamber.
- the catheter components are connected with each other by means of an epoxy resin 6 (ethoxylin resin) which also has a sealing function.
- an epoxy resin 6 ethoxylin resin
- an air volume 8 is enclosed, and which extends from a connector 9 into the cylindrical chamber 4.
- a cock 10 is subsequently closed, and the catheter with the open connector 9 thereof at its left-hand end introduced into a liquid vessel, for example, a blood vessel, the enclosed air volume 8 varies in accordance with Boyle-Mariottes' Law.
- the particular air volume thus corresponds to the pressure of the saline solution 7, and consequently to the pressure which is to be measured, and is converted into an electrical signal through intermediary of the platinum electrodes 3 which are located in a bridge provided for resistance measurement.
- the resistance between the wires 3 is namely dependent upon the length of the column of the saline solution which borders the air volume 8.
- the resistance bridge 12, 13 is powered by means of an alternating current source 11 in order to avoid polarization of the electrodes 3.
- an amplifier 14 For receiving the output signals of the bridge 12, 13 there is utilized an amplifier 14.
- the electrical pressure signal is then further processed by an arrangement 15, for example, indicated.
- the dimensions of the transducer components 1 through 10 may be maintained extremely small. In an exemplary embodiment, the outer diameter thereof was 1.3 mm, and the length of the capillary tube 5 was 1.9 mm.
- the pressure transducer distinguishes over most of the constructions described in publications in that it utilizes an enclosed elastic gas volume in lieu of a membrane.
- the advantage thereof is that a high degree of sensitivity may be attained on the basis of the elasticity of the gas volume, and the difficulty manufactured membrane attachment is eliminated.
- the arrangement may be provided with a resistance which has a negative thermal coefficient. Since electrolytes, for example, saline solutions, belong to this type of resistance media, by employing an electrolyte of the above-described type there are obtained very good thermal operating properties. The electrolyte itself thus forms the resistance having negative thermal coefficients.
- the measured temperature influences are comparable with the best published values, approximately 0.5 mm Hg/°C.
- the invention is not restricted to the utilization of an ohmic resistance variation for generation of the electrical pressure signal.
- a capacitive pressure transducer can be formed, having the same construction as that above-described.
- the foregoing is achieved when the wires 3 in the measuring chamber 4 are insulated from the liquid 7 through the interposition of an insulating material cylinder 16.
- the insulating material cylinder 16 may be provided only for capacitive measurements, and consequently is shown in chaindotted representation. In this instance, the liquid must have a high specific resistance and a high dielectric value.
- the pressure variations are herein converted into changes in the capacitance between the electrodes 3.
- the temperature balance is present when the thermal dependency of the dielectric value of the liquid balances the thermal expansion of the gas.
- the equation (1) can be employed in order to form a linearized supply circuit which will correct the non-linearity of the pressure transducer.
- Connected to the supply circuit may be a known analog multiplier, which is employed for the purpose of dividing the output voltage which is received from the arrangement 15 with the difference between an adjustable constant voltage and the output voltage.
- arithmetic mathematical operation which may be carried out in an analog form, there is received an output signal which, with respect to the applied pressure, is linear at a precision which is better than ⁇ 2%.
- the arithmetic mathematical operations may also be carried out with a corresponding digital arrangement.
- the construction of the pressure transducer system may be varied within the scope of the invention, depending upon the degree of safety which is required for the measurement. It is suitable that the pressure transducer be galvanically protected from ground, so as to prevent leakage current. This may be effected by means of, for example, known insulating amplifiers, which facilitate the control of a power operated recorder or the like by the pressure signal.
- the exemplary embodiment requires very little energy, so that an energy source which is insulated from ground, for example, a battery, may be employed without difficulty when a DC/AC converter is associated therewith.
- the input voltage of the resistance bridge should have a low amplitude, approximately 100 mV, and a relatively high frequency, approximately 25 kHz.
Landscapes
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Cardiology (AREA)
- General Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Physiology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Electromagnetism (AREA)
- Vascular Medicine (AREA)
- Measuring Fluid Pressure (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7314083A SE381985B (sv) | 1973-10-17 | 1973-10-17 | Miniatyriserad tryckgivare for fysiologiska metningar |
SW7314083 | 1973-10-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3942382A true US3942382A (en) | 1976-03-09 |
Family
ID=20318838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/515,682 Expired - Lifetime US3942382A (en) | 1973-10-17 | 1974-10-16 | Pressure transducer |
Country Status (6)
Country | Link |
---|---|
US (1) | US3942382A (de) |
DE (1) | DE2447529C3 (de) |
FR (1) | FR2248496B1 (de) |
GB (1) | GB1484364A (de) |
NL (1) | NL7413702A (de) |
SE (1) | SE381985B (de) |
Cited By (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2420128A1 (fr) * | 1978-03-17 | 1979-10-12 | Siemens Ag | Transducteur de pression |
EP0006577A1 (de) * | 1978-06-27 | 1980-01-09 | Siemens Aktiengesellschaft | Katheter zum Einführen in ein Gefäss eines Patienten |
US4214487A (en) * | 1977-10-08 | 1980-07-29 | Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung | Apparatus for measuring the pressure in a very small volume |
US4297890A (en) * | 1979-06-07 | 1981-11-03 | Siemens Aktiengesellschaft | Pressure transducer |
WO1985005678A1 (en) * | 1984-05-29 | 1985-12-19 | Norman Barrie Jones | Pressure or temperature transducer |
US5450853A (en) * | 1993-10-22 | 1995-09-19 | Scimed Life Systems, Inc. | Pressure sensor |
US5855559A (en) * | 1997-02-14 | 1999-01-05 | Tricardia, Inc. | Hemostatic agent delivery device having built-in pressure sensor |
WO1999018850A1 (en) * | 1997-10-14 | 1999-04-22 | Data Sciences International, Inc. | Catheter with pressure transducer next to the distal end |
US5935083A (en) * | 1996-07-03 | 1999-08-10 | Williams; Paul A. | Device for body fluid pressure measurement |
US6193670B1 (en) | 1997-02-14 | 2001-02-27 | Tricardia, Llc | Hemostatic agent delivery device having built-in pressure sensor |
US6296615B1 (en) | 1999-03-05 | 2001-10-02 | Data Sciences International, Inc. | Catheter with physiological sensor |
US6409674B1 (en) | 1998-09-24 | 2002-06-25 | Data Sciences International, Inc. | Implantable sensor with wireless communication |
US6450972B1 (en) * | 1997-06-07 | 2002-09-17 | Meinhard Knoll | Sensor system for measuring pressure profiles |
US20030136417A1 (en) * | 2002-01-22 | 2003-07-24 | Michael Fonseca | Implantable wireless sensor |
US20050015014A1 (en) * | 2002-01-22 | 2005-01-20 | Michael Fonseca | Implantable wireless sensor for pressure measurement within the heart |
US20050187482A1 (en) * | 2003-09-16 | 2005-08-25 | O'brien David | Implantable wireless sensor |
US20060177956A1 (en) * | 2005-02-10 | 2006-08-10 | Cardiomems, Inc. | Method of manufacturing a hermetic chamber with electrical feedthroughs |
US20060200031A1 (en) * | 2005-03-03 | 2006-09-07 | Jason White | Apparatus and method for sensor deployment and fixation |
US7147604B1 (en) | 2002-08-07 | 2006-12-12 | Cardiomems, Inc. | High Q factor sensor |
US20060287602A1 (en) * | 2005-06-21 | 2006-12-21 | Cardiomems, Inc. | Implantable wireless sensor for in vivo pressure measurement |
US20060283007A1 (en) * | 2005-06-21 | 2006-12-21 | Cardiomems, Inc. | Method of manufacturing implantable wireless sensor for in vivo pressure measurement |
US20070096715A1 (en) * | 2004-11-01 | 2007-05-03 | Cardiomems, Inc. | Communicating with an Implanted Wireless Sensor |
US20070247138A1 (en) * | 2004-11-01 | 2007-10-25 | Miller Donald J | Communicating with an implanted wireless sensor |
US20070261497A1 (en) * | 2005-02-10 | 2007-11-15 | Cardiomems, Inc. | Hermatic Chamber With Electrical Feedthroughs |
US7658196B2 (en) | 2005-02-24 | 2010-02-09 | Ethicon Endo-Surgery, Inc. | System and method for determining implanted device orientation |
US20100058583A1 (en) * | 2005-06-21 | 2010-03-11 | Florent Cros | Method of manufacturing implantable wireless sensor for in vivo pressure measurement |
US7775966B2 (en) | 2005-02-24 | 2010-08-17 | Ethicon Endo-Surgery, Inc. | Non-invasive pressure measurement in a fluid adjustable restrictive device |
US7775215B2 (en) | 2005-02-24 | 2010-08-17 | Ethicon Endo-Surgery, Inc. | System and method for determining implanted device positioning and obtaining pressure data |
US7844342B2 (en) | 2008-02-07 | 2010-11-30 | Ethicon Endo-Surgery, Inc. | Powering implantable restriction systems using light |
US7927270B2 (en) | 2005-02-24 | 2011-04-19 | Ethicon Endo-Surgery, Inc. | External mechanical pressure sensor for gastric band pressure measurements |
US8016745B2 (en) | 2005-02-24 | 2011-09-13 | Ethicon Endo-Surgery, Inc. | Monitoring of a food intake restriction device |
US8016744B2 (en) | 2005-02-24 | 2011-09-13 | Ethicon Endo-Surgery, Inc. | External pressure-based gastric band adjustment system and method |
US8021307B2 (en) | 2005-03-03 | 2011-09-20 | Cardiomems, Inc. | Apparatus and method for sensor deployment and fixation |
US8034065B2 (en) | 2008-02-26 | 2011-10-11 | Ethicon Endo-Surgery, Inc. | Controlling pressure in adjustable restriction devices |
US8057492B2 (en) | 2008-02-12 | 2011-11-15 | Ethicon Endo-Surgery, Inc. | Automatically adjusting band system with MEMS pump |
US8066629B2 (en) | 2005-02-24 | 2011-11-29 | Ethicon Endo-Surgery, Inc. | Apparatus for adjustment and sensing of gastric band pressure |
US8100870B2 (en) | 2007-12-14 | 2012-01-24 | Ethicon Endo-Surgery, Inc. | Adjustable height gastric restriction devices and methods |
US8114345B2 (en) | 2008-02-08 | 2012-02-14 | Ethicon Endo-Surgery, Inc. | System and method of sterilizing an implantable medical device |
US8142452B2 (en) | 2007-12-27 | 2012-03-27 | Ethicon Endo-Surgery, Inc. | Controlling pressure in adjustable restriction devices |
US8152710B2 (en) | 2006-04-06 | 2012-04-10 | Ethicon Endo-Surgery, Inc. | Physiological parameter analysis for an implantable restriction device and a data logger |
US8187162B2 (en) | 2008-03-06 | 2012-05-29 | Ethicon Endo-Surgery, Inc. | Reorientation port |
US8187163B2 (en) | 2007-12-10 | 2012-05-29 | Ethicon Endo-Surgery, Inc. | Methods for implanting a gastric restriction device |
US8192350B2 (en) | 2008-01-28 | 2012-06-05 | Ethicon Endo-Surgery, Inc. | Methods and devices for measuring impedance in a gastric restriction system |
US8221439B2 (en) | 2008-02-07 | 2012-07-17 | Ethicon Endo-Surgery, Inc. | Powering implantable restriction systems using kinetic motion |
US8233995B2 (en) | 2008-03-06 | 2012-07-31 | Ethicon Endo-Surgery, Inc. | System and method of aligning an implantable antenna |
US8337389B2 (en) | 2008-01-28 | 2012-12-25 | Ethicon Endo-Surgery, Inc. | Methods and devices for diagnosing performance of a gastric restriction system |
US20130019688A1 (en) * | 2011-07-21 | 2013-01-24 | Yi-Chung Tung | Measurement system for measuring pressure of fluid and manufacture method thereof |
US8377079B2 (en) | 2007-12-27 | 2013-02-19 | Ethicon Endo-Surgery, Inc. | Constant force mechanisms for regulating restriction devices |
US8591532B2 (en) | 2008-02-12 | 2013-11-26 | Ethicon Endo-Sugery, Inc. | Automatically adjusting band system |
US8591395B2 (en) | 2008-01-28 | 2013-11-26 | Ethicon Endo-Surgery, Inc. | Gastric restriction device data handling devices and methods |
US8870742B2 (en) | 2006-04-06 | 2014-10-28 | Ethicon Endo-Surgery, Inc. | GUI for an implantable restriction device and a data logger |
US8896324B2 (en) | 2003-09-16 | 2014-11-25 | Cardiomems, Inc. | System, apparatus, and method for in-vivo assessment of relative position of an implant |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2566369A (en) * | 1946-01-23 | 1951-09-04 | Henry M Putman | Pressure gauge |
US3190122A (en) * | 1960-09-01 | 1965-06-22 | Simmonds Precision Products | Mercurial capacitors for remote indication of pressure |
US3496775A (en) * | 1967-08-28 | 1970-02-24 | Simmonds Precision Products | Pressure sensing device |
-
1973
- 1973-10-17 SE SE7314083A patent/SE381985B/xx unknown
-
1974
- 1974-10-04 DE DE2447529A patent/DE2447529C3/de not_active Expired
- 1974-10-16 FR FR7434795A patent/FR2248496B1/fr not_active Expired
- 1974-10-16 US US05/515,682 patent/US3942382A/en not_active Expired - Lifetime
- 1974-10-17 GB GB45108/74A patent/GB1484364A/en not_active Expired
- 1974-10-18 NL NL7413702A patent/NL7413702A/xx not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2566369A (en) * | 1946-01-23 | 1951-09-04 | Henry M Putman | Pressure gauge |
US3190122A (en) * | 1960-09-01 | 1965-06-22 | Simmonds Precision Products | Mercurial capacitors for remote indication of pressure |
US3496775A (en) * | 1967-08-28 | 1970-02-24 | Simmonds Precision Products | Pressure sensing device |
Cited By (93)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4214487A (en) * | 1977-10-08 | 1980-07-29 | Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung | Apparatus for measuring the pressure in a very small volume |
US4261208A (en) * | 1978-03-17 | 1981-04-14 | Siemens Aktiengesellschaft | Pressure transducer |
FR2420128A1 (fr) * | 1978-03-17 | 1979-10-12 | Siemens Ag | Transducteur de pression |
EP0006577A1 (de) * | 1978-06-27 | 1980-01-09 | Siemens Aktiengesellschaft | Katheter zum Einführen in ein Gefäss eines Patienten |
US4297890A (en) * | 1979-06-07 | 1981-11-03 | Siemens Aktiengesellschaft | Pressure transducer |
WO1985005678A1 (en) * | 1984-05-29 | 1985-12-19 | Norman Barrie Jones | Pressure or temperature transducer |
GB2183826A (en) * | 1984-05-29 | 1987-06-10 | Norman B Jones | Pressure or temperature transducer |
US5450853A (en) * | 1993-10-22 | 1995-09-19 | Scimed Life Systems, Inc. | Pressure sensor |
US5935083A (en) * | 1996-07-03 | 1999-08-10 | Williams; Paul A. | Device for body fluid pressure measurement |
US6193670B1 (en) | 1997-02-14 | 2001-02-27 | Tricardia, Llc | Hemostatic agent delivery device having built-in pressure sensor |
US5855559A (en) * | 1997-02-14 | 1999-01-05 | Tricardia, Inc. | Hemostatic agent delivery device having built-in pressure sensor |
US6450972B1 (en) * | 1997-06-07 | 2002-09-17 | Meinhard Knoll | Sensor system for measuring pressure profiles |
US7347822B2 (en) | 1997-10-14 | 2008-03-25 | Transoma Medical, Inc. | Pressure measurement device |
WO1999018850A1 (en) * | 1997-10-14 | 1999-04-22 | Data Sciences International, Inc. | Catheter with pressure transducer next to the distal end |
US6379308B1 (en) | 1997-10-14 | 2002-04-30 | Data Sciences International, Inc. | Pressure measurement device |
US20060094966A1 (en) * | 1997-10-14 | 2006-05-04 | Transoma Medical, Inc. | Pressure measurement device |
US6033366A (en) * | 1997-10-14 | 2000-03-07 | Data Sciences International, Inc. | Pressure measurement device |
US7025727B2 (en) | 1997-10-14 | 2006-04-11 | Transoma Medical, Inc. | Pressure measurement device |
US20050159789A1 (en) * | 1998-09-24 | 2005-07-21 | Transoma Medical, Inc. | Implantable sensor with wireless communication |
US7425200B2 (en) | 1998-09-24 | 2008-09-16 | Transoma Medical, Inc. | Implantable sensor with wireless communication |
US20020138009A1 (en) * | 1998-09-24 | 2002-09-26 | Data Sciences International, Inc. | Implantable sensor with wireless communication |
US6409674B1 (en) | 1998-09-24 | 2002-06-25 | Data Sciences International, Inc. | Implantable sensor with wireless communication |
US20030195428A1 (en) * | 1999-03-05 | 2003-10-16 | Data Sciences International, Inc. | Catheter with physiological sensor |
US6659959B2 (en) | 1999-03-05 | 2003-12-09 | Transoma Medical, Inc. | Catheter with physiological sensor |
US6296615B1 (en) | 1999-03-05 | 2001-10-02 | Data Sciences International, Inc. | Catheter with physiological sensor |
US7481774B2 (en) | 1999-03-05 | 2009-01-27 | Transoma Medical, Inc. | Catheter with physiological sensor |
US20030136417A1 (en) * | 2002-01-22 | 2003-07-24 | Michael Fonseca | Implantable wireless sensor |
US7699059B2 (en) | 2002-01-22 | 2010-04-20 | Cardiomems, Inc. | Implantable wireless sensor |
US7481771B2 (en) | 2002-01-22 | 2009-01-27 | Cardiomems, Inc. | Implantable wireless sensor for pressure measurement within the heart |
US20050015014A1 (en) * | 2002-01-22 | 2005-01-20 | Michael Fonseca | Implantable wireless sensor for pressure measurement within the heart |
US7147604B1 (en) | 2002-08-07 | 2006-12-12 | Cardiomems, Inc. | High Q factor sensor |
US8896324B2 (en) | 2003-09-16 | 2014-11-25 | Cardiomems, Inc. | System, apparatus, and method for in-vivo assessment of relative position of an implant |
US20060235310A1 (en) * | 2003-09-16 | 2006-10-19 | O'brien David | Method of manufacturing an implantable wireless sensor |
US9265428B2 (en) | 2003-09-16 | 2016-02-23 | St. Jude Medical Luxembourg Holdings Ii S.A.R.L. (“Sjm Lux Ii”) | Implantable wireless sensor |
US7574792B2 (en) | 2003-09-16 | 2009-08-18 | Cardiomems, Inc. | Method of manufacturing an implantable wireless sensor |
US20050187482A1 (en) * | 2003-09-16 | 2005-08-25 | O'brien David | Implantable wireless sensor |
US20090224837A1 (en) * | 2004-11-01 | 2009-09-10 | Cardiomems, Inc. | Preventing a False Lock in a Phase Lock Loop |
US20090224773A1 (en) * | 2004-11-01 | 2009-09-10 | Cardiomems, Inc. | Communicating With an Implanted Wireless Sensor |
US20070247138A1 (en) * | 2004-11-01 | 2007-10-25 | Miller Donald J | Communicating with an implanted wireless sensor |
US7245117B1 (en) | 2004-11-01 | 2007-07-17 | Cardiomems, Inc. | Communicating with implanted wireless sensor |
US7466120B2 (en) | 2004-11-01 | 2008-12-16 | Cardiomems, Inc. | Communicating with an implanted wireless sensor |
US20070096715A1 (en) * | 2004-11-01 | 2007-05-03 | Cardiomems, Inc. | Communicating with an Implanted Wireless Sensor |
US7932732B2 (en) | 2004-11-01 | 2011-04-26 | Cardiomems, Inc. | Preventing a false lock in a phase lock loop |
US7839153B2 (en) | 2004-11-01 | 2010-11-23 | Cardiomems, Inc. | Communicating with an implanted wireless sensor |
US7550978B2 (en) | 2004-11-01 | 2009-06-23 | Cardiomems, Inc. | Communicating with an implanted wireless sensor |
US8237451B2 (en) | 2004-11-01 | 2012-08-07 | Cardiomems, Inc. | Communicating with an implanted wireless sensor |
US7647836B2 (en) | 2005-02-10 | 2010-01-19 | Cardiomems, Inc. | Hermetic chamber with electrical feedthroughs |
US20060174712A1 (en) * | 2005-02-10 | 2006-08-10 | Cardiomems, Inc. | Hermetic chamber with electrical feedthroughs |
US20060177956A1 (en) * | 2005-02-10 | 2006-08-10 | Cardiomems, Inc. | Method of manufacturing a hermetic chamber with electrical feedthroughs |
US20070261497A1 (en) * | 2005-02-10 | 2007-11-15 | Cardiomems, Inc. | Hermatic Chamber With Electrical Feedthroughs |
US7854172B2 (en) | 2005-02-10 | 2010-12-21 | Cardiomems, Inc. | Hermetic chamber with electrical feedthroughs |
US7662653B2 (en) | 2005-02-10 | 2010-02-16 | Cardiomems, Inc. | Method of manufacturing a hermetic chamber with electrical feedthroughs |
US20090145623A1 (en) * | 2005-02-10 | 2009-06-11 | O'brien David | Hermetic Chamber with Electrical Feedthroughs |
US7775215B2 (en) | 2005-02-24 | 2010-08-17 | Ethicon Endo-Surgery, Inc. | System and method for determining implanted device positioning and obtaining pressure data |
US7775966B2 (en) | 2005-02-24 | 2010-08-17 | Ethicon Endo-Surgery, Inc. | Non-invasive pressure measurement in a fluid adjustable restrictive device |
US8066629B2 (en) | 2005-02-24 | 2011-11-29 | Ethicon Endo-Surgery, Inc. | Apparatus for adjustment and sensing of gastric band pressure |
US7658196B2 (en) | 2005-02-24 | 2010-02-09 | Ethicon Endo-Surgery, Inc. | System and method for determining implanted device orientation |
US7927270B2 (en) | 2005-02-24 | 2011-04-19 | Ethicon Endo-Surgery, Inc. | External mechanical pressure sensor for gastric band pressure measurements |
US8016745B2 (en) | 2005-02-24 | 2011-09-13 | Ethicon Endo-Surgery, Inc. | Monitoring of a food intake restriction device |
US8016744B2 (en) | 2005-02-24 | 2011-09-13 | Ethicon Endo-Surgery, Inc. | External pressure-based gastric band adjustment system and method |
US20060200031A1 (en) * | 2005-03-03 | 2006-09-07 | Jason White | Apparatus and method for sensor deployment and fixation |
US8118749B2 (en) | 2005-03-03 | 2012-02-21 | Cardiomems, Inc. | Apparatus and method for sensor deployment and fixation |
US8021307B2 (en) | 2005-03-03 | 2011-09-20 | Cardiomems, Inc. | Apparatus and method for sensor deployment and fixation |
US11890082B2 (en) | 2005-06-21 | 2024-02-06 | Tc1 Llc | System and method for calculating a lumen pressure utilizing sensor calibration parameters |
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Also Published As
Publication number | Publication date |
---|---|
GB1484364A (en) | 1977-09-01 |
NL7413702A (nl) | 1975-04-21 |
FR2248496A1 (de) | 1975-05-16 |
SE381985B (sv) | 1976-01-12 |
AU7429874A (en) | 1976-04-15 |
DE2447529C3 (de) | 1979-07-26 |
DE2447529B2 (de) | 1978-11-16 |
FR2248496B1 (de) | 1982-01-22 |
DE2447529A1 (de) | 1975-04-30 |
SE7314083L (de) | 1975-04-18 |
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